[Tatsfield]

I had this clunking from my Geartronic box after a software update. I was recommended on this forum to take the car to an empty space, and repetitively engage D from stationary, move two or three yards, stop, put the selector into neutral, engage reverse, drive two or three yards, stop and repeat the operation repeatedly. I did that and found that the clunking stopped and only came back if I selected reverse while still coming to a stop moving forwards in Drive when manoeuvring in tight spaces, which is bad practice and upsets the gearbox operating system but I forget from time to time and do it when I'm in a hurry. Otherwise this conditioning process which teaches the box to change from R through N to D and back seemed to do the trick.